| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Atractylodes lancea | Rhizome | -- | 33.0 | -0.3 | * |
| Cyperus rotundus | Rhizome | -- | 33.0 | -0.3 | * |
| Allium cepa | Seed | -- | 34.0 | -0.3 | * |
| Phaseolus acutifolius | Seed | 25.0 | 34.0 | -0.3 | * |
| Cajanus cajan | Seed | 25.0 | 34.0 | -0.3 | * |
| Cinnamomum verum | Leaf | -- | 34.0 | -0.3 | * |
| Atractylodes ovata | Rhizome | 26.0 | 32.0 | -0.3 | * |
| Erythroxylum novogranatense | Leaf | 16.0 | 33.0 | -0.3 | * |
| Camellia sinensis | Leaf | -- | 30.0 | -0.3 | * |
| Anemarrhena asphodeloides | Rhizome | 19.0 | 27.0 | -0.3 | * |
| Siegesbeckia orientalis | Plant | -- | 17.0 | -0.3 | * |
| Quercus velutina | Stem | 5.0 | 93.0 | -0.3 | * |
| Erythroxylum coca | Leaf | 18.0 | 29.0 | -0.3 | * |
| Eriobotrya japonica | Leaf | -- | 28.0 | -0.4 | Chen, H.C. and Lin, S.M. 1988. Determination of Mineral Elements in Certain Crude Drugs (Part 1), Kaohsiung J. Med. Sci., 4: 259-272. |
| Brassica oleracea var. sabellica l. | Leaf | 4.0 | 28.0 | -0.4 | * |
| Quercus phellos | Stem | 2.0 | 92.0 | -0.4 | * |
| Symphoricarpos orbiculatus | Stem | 2.0 | 92.0 | -0.4 | * |
| Magnolia officinalis | Bark | -- | 9.0 | -0.4 | * |
| Sorbus aucubaria | Fruit | 1.0 | 18.0 | -0.4 | * |
| Euodia rutaecarpa | Fruit | -- | 18.0 | -0.4 | * |